com·​mis·​cu·​um | \ kəˈmiskyəwəm\
plural commiscua\ -​wə \ also commiscuums\ -​wəmz \

Definition of commiscuum 

: a subdivision of a comparium comprising organisms that can interbreed to produce fertile hybrids and being usually equivalent in scope to a taxonomic species

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History and Etymology for commiscuum

New Latin, from Latin, neuter of commiscuus common, from commiscere to mix together

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